Please, i need to solve the following exercise, thank you.
Let X` denote the mean of a random sample of size n from a distribution that is n (µ,σ2 ). Find the limiting distribution of Xn`.

You have already been told to revise the central limit theorem, do that and it will give you the result immediately. See here the section titled "Classical central limit theorem" answers this question (as asked ...).

(This is of course one of those probability and statistics questions where the wording indicates a lack of comprehension of the subject by the question setter/text book author.)